objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()

[ Upstream commit 107a23185d990e3df6638d9a84c835f963fe30a6 ]

The csts_state_names[] array only has six sparse entries, but the
iteration code in nvmet_ctrl_state_show() iterates seven, resulting in a
potential out-of-bounds stack read.  Fix that.

Fixes the following warning with an UBSAN kernel:

  vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section

Fixes: 649fd41420a8 ("nvmet: add debugfs support")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Chaitanya Kulkarni <kch@nvidia.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/f1f60858ee7a941863dc7f5506c540cb9f97b5f6.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/target/debugfs.c b/drivers/nvme/target/debugfs.c
index 220c7391fc19adc9f151bacdc0fe075f65c3e0a1..c6571fbd35e30ec82e8392411fc589e5f6265104 100644 (file)
--- a/drivers/nvme/target/debugfs.c
+++ b/drivers/nvme/target/debugfs.c
@@ -78,7 +78,7 @@ static int nvmet_ctrl_state_show(struct seq_file *m, void *p)
        bool sep = false;
        int i;
 
-       for (i = 0; i < 7; i++) {
+       for (i = 0; i < ARRAY_SIZE(csts_state_names); i++) {
                int state = BIT(i);
 
                if (!(ctrl->csts & state))